Fatigue crack propagation in S1100M and S1300Q structural steels and their welded joints

Absztrakt

Nowadays, in case of thick plates, materials with a yield strength of 1100 MPa or 1300 MPa are available, depending on the production method. However, the resistance of these materials to fatigue crack propagation (FCP) is still a question. Thus, in the present research work, tests are presented on the fatigue crack propagation resistance of S1100M and S1300Q base materials and their welded joints. For the welded joints two different types of filler materials from different strength categories were used, so these were also compared in the terms of fatigue crack propagation resistance. The results show a significant difference between cracks propagating in the rolling direction and in the thickness direction. However, for the two different filler metals, the resistance of the welded joints to fatigue crack propagation is considered to be the same. For S1100M, the fatigue fracture toughness of welded joints typically exceeds that of the base material. In the case of S1300Q, there is no significant difference between the fatigue fracture toughness of the base material and that of the welded joints.